Magnetic recording medium and magnetic storage apparatus

Active Publication Date: 2018-08-09
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent aims to create a magnetic recording medium that has a high signal-to-noise ratio (SNR).

Problems solved by technology

However, with existing recording methods, it is difficult to increase the recording density of hard disk drives.
However, in conventional techniques, an (001) orientation of a magnetic layer is insufficient.

Method used

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  • Magnetic recording medium and magnetic storage apparatus
  • Magnetic recording medium and magnetic storage apparatus
  • Magnetic recording medium and magnetic storage apparatus

Examples

Experimental program
Comparison scheme
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working examples

[0097]In the following, specific working examples will be described. The present invention is not limited to the following working examples.

working example 1

[0098]The magnetic recording medium 100 (see FIG. 1) was produced. In the following, a process of producing the magnetic recording medium 100 will be described.

[0099]As a seed layer, a film made of Cr-50 at. % Ti (an alloy with a CR content of 50 at. % and a Ti content of 50 at. %) and having a thickness of 25 nm was formed on a glass substrate 1 having an outer diameter of 2.5 inches. Subsequently, the substrate 1 was heated at 300° C. Subsequently, as an orientation control layer 7, a film made of Cr-5 at. % Mn (an alloy with a Cr content of 95 at. % and a Mn content of 5 at. %) and having a thickness of 20 nm was formed. Next, as a second underlayer 4, a W layer having a thickness of 20 nm was formed. On the second underlayer 4, a W-3.2WO3 (alloy in which the content of W is 96.8 mol % and the content of WO3 is 3.2 mol %) layer having a non-granular structure and having a thickness of 20 nm was formed as a first underlayer 5. Further, as a barrier layer 6, a MgO film having a thi...

working examples 2 to 4

[0100]Magnetic recording mediums were produced for the working examples 2 to 4 in a manner similar to that in the working example 1, except that the composition of the first underlayer 5 was changed to W-6.9WO3, W-16.5WO3, and W-25WO3, respectively.

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Abstract

A magnetic recording medium includes: a substrate; an underlayer; and a magnetic layer including an alloy having a L10 type crystal structure whose plane orientation is (001). The substrate, the underlayer, and the magnetic layer are stacked in this order. The underlayer includes a first underlayer. The first underlayer is a crystalline layer that includes a material containing Al, Ag, Cu, W, or Mo as a main component element and includes an oxide of the main component element, a content of the oxide of the main component element in the first underlayer being in a range of from 2 mol % to 30 mol %.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims the benefit of priority under 35 U.S.C. § 119 of Japanese Patent Application No. 2017-020745 filed on Feb. 7, 2017, the contents of which are incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The disclosures herein generally relate to a magnetic recording medium and a magnetic storage apparatus.2. Description of the Related Art[0003]In recent years, demand for increasing the storage capacity of hard disk drives has been growing.[0004]However, with existing recording methods, it is difficult to increase the recording density of hard disk drives.[0005]A heat-assisted magnetic recording method is a technique that has been actively studied and attracted attention as a next generation recording method. The heat-assisted magnetic recording method is a recording method in which a magnetic head irradiates a magnetic recording medium with near-field light to ...

Claims

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Application Information

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IPC IPC(8): G11B5/65G11B5/66
CPCG11B5/65G11B5/66G11B2005/0021G11B5/737G11B5/7368
InventorFUKUSHIMA, TAKAYUKIOHASHI, HARUHISAZHANG, LEIMURAKAMI, YUJISHIBATA, HISATOYAMAGUCHI, TAKEHIROKANBE, TETSUYA
OwnerSHOWA DENKO KK